PHOENIX -- Jarrod Parker's Tommy John surgery on Monday went well, according to both Parker and the A's.

After having the surgery to replace the ligament in his right elbow for the second time in five years, the right-hander who had been scheduled to be Oakland's opening day starter, sent out a tweet saying ``All good!'' after Dr. James Andrews and his team were finished in Pensacola, Fla.

On Tuesday morning he came back with another tweet, this one saying he wanted ``to thank everyone for the support, nice messages and kind words,'' adding that he'd just finished his first follow up therapy.

A's manager Bob Melvin, one of many who flooded Parker's twitter account and cellphone with words of encouragement, said he hasn't yet talked with Parker but he'd heard about the surgery's success.